added warmup for nodejs

demo/node.js

@@ -6,6 +6,8 @@ const tf = require('@tensorflow/tfjs-node'); // or const tf = require('@tensorfl
 // load specific version of Human library that matches TensorFlow mode
 const Human = require('../dist/human.node.js').default; // or const Human = require('../dist/human.node-gpu.js').default;
 
+let human = null;
+
 const myConfig = {
   backend: 'tensorflow',
   console: true,
@@ -25,13 +27,16 @@ const myConfig = {
   },
 };
 
-async function detect(input) {
+async function init() {
   // wait until tf is ready
   await tf.ready();
   // create instance of human
-  const human = new Human(myConfig);
+  human = new Human(myConfig);
   // pre-load models
   await human.load();
+}
+
+async function detect(input) {
   // read input image file and create tensor to be used for processing
   const buffer = fs.readFileSync(input);
   const decoded = human.tf.node.decodeImage(buffer);
@@ -40,6 +45,7 @@ async function detect(input) {
   decoded.dispose();
   casted.dispose();
   // image shape contains image dimensions and depth
+  log.warn('Face model is disabled in NodeJS due to missing required TFJS functions');
   log.state('Processing:', image.shape);
   // must disable face model when runing in tfjs-node as it's missing required ops
   // see <https://github.com/tensorflow/tfjs/issues/4066>
@@ -52,11 +58,26 @@ async function detect(input) {
   log.data(result);
 }
 
+async function test() {
+  log.state('Processing embedded warmup image');
+  log.warn('Face model is disabled in NodeJS due to missing required TFJS functions');
+  myConfig.face.enabled = false;
+  myConfig.warmup = 'full';
+  const result = await human.warmup(myConfig);
+  log.data(result);
+}
+
 async function main() {
   log.info('NodeJS:', process.version);
-  if (process.argv.length !== 3) log.error('Parameters: <input image>');
-  else if (!fs.existsSync(process.argv[2])) log.error(`File not found: ${process.argv[2]}`);
-  else detect(process.argv[2]);
+  await init();
+  if (process.argv.length !== 3) {
+    log.warn('Parameters: <input image> missing');
+    await test();
+  } else if (!fs.existsSync(process.argv[2])) {
+    log.error(`File not found: ${process.argv[2]}`);
+  } else {
+    await detect(process.argv[2]);
+  }
 }
 
 main();

src/human.js

@@ -444,7 +444,7 @@ class Human {
     }
     if (blob) {
       const bitmap = await createImageBitmap(blob);
-      res = await this.detect(bitmap, config);
+      res = await this.detect(bitmap, this.config);
       bitmap.close();
     }
     return res;
@@ -474,13 +474,25 @@ class Human {
         const ctx = canvas.getContext('2d');
         ctx.drawImage(img, 0, 0);
         const data = ctx.getImageData(0, 0, size, size);
-        this.detect(data, config).then((res) => resolve(res));
+        this.detect(data, this.config).then((res) => resolve(res));
       };
       if (src) img.src = src;
       else resolve(null);
     });
   }
 
+  async warmupNode() {
+    const atob = (str) => Buffer.from(str, 'base64');
+    const img = this.config.warmup === 'face' ? atob(sample.face) : atob(sample.body);
+    const data = tf.node.decodeJpeg(img);
+    const expanded = data.expandDims(0);
+    tf.dispose(data);
+    // log('Input:', expanded);
+    const res = await this.detect(expanded, this.config);
+    tf.dispose(expanded);
+    return res;
+  }
+
   async warmup(userConfig) {
     const t0 = now();
     if (userConfig) this.config = mergeDeep(this.config, userConfig);
@@ -488,7 +500,8 @@ class Human {
     this.config.videoOptimized = false;
     let res;
     if (typeof createImageBitmap === 'function') res = await this.warmupBitmap();
-    else res = await this.warmupCanvas();
+    else if (typeof Image !== 'undefined') res = await this.warmupCanvas();
+    else res = await this.warmupNode();
     this.config.videoOptimized = video;
     const t1 = now();
     log('Warmup', this.config.warmup, Math.round(t1 - t0), 'ms', res);